TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3010
SUBJECT: Further analysis of the short Swift-BAT GRB 050202
DATE: 05/02/03 23:28:27 GMT
FROM: Takanori Sakamoto at NASA/GSFC
T. Sakamoto (GSFC), S. Barthelmy, L. Barbier, J. Cummings (GSFC),
E. Fenimore (LANL), N. Gehrels, D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC),
on behalf of the Swift-BAT team:
We have continued the analysis of Swift-BAT GRB 050202 (Tueller, et al.,
GCN Circ 3005). The refined position is 290.575, -38.735 (J2000)
with an uncertainty of 4 arcmin (radius, statistical plus systematic).
We find that the T_90 time for this burst is 0.080 sec. The ~150 sec
long-term variation on which the spike rides (Circ 3005) has been shown
to be due to Sco X-1. A fluctuation from Sco X-1 also contributed
to the larger duration value given in Circ 3005.
We have fit the burst spectrum with power-law: index 1.4 +-/0.3.
This short burst is in the intermediate hard range.
In the 15-350 keV band, the fluence is 6.5e-8 erg/cm2 and the peak flux
is 4.8 ph/cm2/sec.
We note that the the Swift spacecraft did not slew to this burst
because the burst location was within the Sun observing constraint.